Identification_Information:
Citation:
Citation_Information:
Originator: USGS

Publication_Date: 19970414

Title: Marlette Lake

Geospatial_Data_Presentation_Form:
"map"

Publication_Information:
Publication_Place: Reston, VA

Publisher:
USGS

Description:
Abstract:
The Digital Raster Graphic (DRG) is a raster image of a
scanned USGS topographic map including the collar information,
georeferenced to the UTM grid.

Purpose:
A DRG is useful as a source or background layer in a GIS,
as a means to perform quality assurance on other digital products,
and as a source for the collection and revision of DLG data. DRG's
can also be merged with other digital data, e.g. DEM's or DOQ's, to
produce a hybrid digital file.

Supplemental_Information:
239835.79192119, 4349391.84226967

Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19970414

Currentness_Reference:
"Ground Condition"

Status:
Progress: Complete

Maintenance_and_Update_Frequency:
"Irregular"

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -120.000000

East_Bounding_Coordinate: -119.875000

North_Bounding_Coordinate: 39.250000

South_Bounding_Coordinate:
39.125000

Keywords:
Theme:
Theme_Keyword_Thesaurus: "None"

Theme_Keyword: digital raster graphic

Theme_Keyword: DRG

Theme_Keyword: topographic map

Place:
Place_Keyword_Thesaurus:
Department of Commerce, 1977, Countries,
Dependencies, Areas of Special Sovereignty, and their Principal
Administrative Divisions (Federal Information Processing Standard
10-3): Washington, Department of Commerce, National Institute of
Standards and Technology.

Place_Keyword: US

Place:
Place_Keyword_Thesaurus:
Department of Commerce, 1987, Codes for
the Identification of the States, The District of Columbia and the
Outlying Areas Of The United States, and Associated Areas (Federal
Information Processing Standard 5-2): Washington, Department of
Commerce, National Institute of Standards and Technology.

Place_Keyword: NV

Place_Keyword:

Place_Keyword:

Place_Keyword:

Access_Constraints: "None"

Use_Constraints:
Acknowledgment of the USGS would be appreciated in
products derived from these data.

Data_Set_Credit:
This DRG was produced through an Innovative
Partnership agreement between The Land Information Technology
Company, Ltd., of Aurora, CO and the USGS.

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The DRG is an 8-bit color image that employs
a color palette to ensure uniform colors throughout a particular DRG
series. All DRG's within a series must have the same RGB value.

Logical_Consistency_Report: Not Applicable

Completeness_Report:
The DRG is a faithfully reproduced digital image of
the original source map. Some differences may be detected between the
source graphic used and the DRG due to the RGB values assigned that
particular color. The intent is to recreate those colors as near as
possible. Data completeness for DRG files reflect content of the source
graphic. Features may have been eliminated or generalized on the source
graphic due to scale and legibility constraints. For information on
collection and inclusion criteria, see U.S. Geological Survey, 1994,
Standards for 1:24,000-Scale Digital Line Graphs and Quadrangle Maps:
National Mapping Program Technical Instructions and U.S. Geological
Survey, 1994, Standards for Digital Line Graphs: National Mapping Program
Technical Instructions.

Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
While the datum of the
published map is retained to be consistent with other USGS digital
data, this image is cast on the UTM and may be INCONSISTENT with the
credit note on the image collar.

Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Refer to the DRG collar for
information about vertical positional accuracy.

Lineage:
Source_Information:
Source_Citation:
Source_Citation_Abbreviation:
map1

8.1 ORIGINATOR: USGS

8.2 PUBLICATION DATE: 1994

8.4 TITLE: Marlette Lake

8.6 GEOSPATIAL DATA PRESENTATION FORM: "map"

--Publication Information--

8.8.1 PUBLICATION PLACE: Reston, VA

8.8.2 PUBLISHER: USGS

Source_Scale_Denominator: 24000

Type_of_Source_Media: "paper"

Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1994

Source_Currentness_Reference: "ground condition"

Source_Contribution:
The source map is scanned to produce the DRG.

Process_Step:
Process_Description:
The production procedures, instrumentation,
hardware, and software used in the collection of standard DRG
products vary depending on systems used at the contract, cooperator
or USGS production sites. The majority of DRG data sets are
acquired through government contract. The process step describes,
in general, the process used in the production of standard DRG data
sets.

1. Production of a DRG begins with the scanning of a paper
7.5-minute topographic map (map1) on a high-resolution scanner.
Scanning resolutions range from 500 - 1000 dpi with the output file
running between 160-300 mb.

2. Removal of screens (descreening) and color quantization to reduce
the number of colors also takes place during the scanning phase.

3. The raw scan file is then transformed and georeferenced using UTM
coordinates of the sixteen 2.5-minute grid ticks, which are obtained
using the in-house produced program COORDAT and stored in a ground
control file. Those sixteen 2.5-minute ticks are interactively
visited and assigned their respective UTM coordinates. USGS program
XSHAPES4 then performs a piecewise linear rubber sheet
transformation.

4. An output resolution of 2.4 meters (8.2 feet) is chosen in order
to resample the file to 250 dpi.

5. The image file is converted to a TIFF and further reduced by
converting the file to a run length encoding Packbits
compression(type 32773).

6. The color palette of the compressed DRG is then standardized by
replacing the original RGB values assigned during the scanning
process with standard RGB value combinations using the in-house
produced TIFFREMAP program.

7. Prior to archiving the DRG undergoes the following quality
assurance procedures:

a. The color index values of each DRG are checked to ensure
the RGB combinations are consistent with the standardized
color palette.

b. All DRG files are inspected to ensure that they are
geometrically consistent with normal map presentation.

c. Selected DRG's are checked to ensure that data elements in
the DRG metadata file correspond to the map collar information
and to the information in the associated image file.

d. Selected DRG's are checked for georeferencing accuracy by
comparing the book value of latitude and longitude tick marks
with corresponding tick intersections in the DRG image.

e. Transformations are checked on selected DRG's by comparing
the positions of well defined points, such as UTM grid
intersections in the graphic product, with the corresponding
image points in the DRG.

USGS DRG production specifications are available on request from
the National Mapping Division and Mid-Continent Mapping Center by
contacting:

Rolla-ESIC
U.S. Geological Survey
1400 Independence Rd., MS231
Rolla, MO 65401-2602
Phone (573)308-3500
Facsimile (573)308-3615
E-mail to mcmcesic@usgs.gov
World Wide Web: http://mcmcweb.er.usgs.gov/drg/

Source_Used_Citation_Abbreviation:
map1

Process_Date:
19970414

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:
Raster_Object_Type: Pixel

Row_Count: 6859

Column_Count:
5269

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:
UTM_Zone_Number: 11

Transverse_Mercator:
Scale_Factor_at_Central_Meridian:
0.9996

4.1.2.1.2.2 LONGITUDE AT CENTRAL MERIDIAN: -117.000

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000.

False_Northing:
0.0

Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column

Coordinate_Representation:
Abscissa_Resolution: 2.43840000

Ordinate_Resolution: -2.43840000

Planar_Distance_Units:
"meters"

Geodetic_Model:
Horizontal_Datum_Name: North American Datum 1927

Ellipsoid_Name: Clarke 1866

Semi-major_Axis: 6378206.4

Denominator_of_Flattening_Ratio:
294.98

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Detail_Citation:
Draft Standards for Digital
Raster Graphic.

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Earth Science Information Center, U.S.
Geological Survey Contact Address

Contact_Address:
Address_Type: "mailing address"

Address: 507 National Center

City: Reston

State_or_Province: Virginia

Postal_Code: 22092

Contact_Voice_Telephone: 1 800 USA MAPS

Contact_Voice_Telephone: 1 703 648 6045

Distribution_Liability:
Although these data have been processed
successfully on a computer system at the USGS, no warranty expressed
or implied is made by the USGS regarding the use of the data on any
other system, nor does the act of distribution constitute any such
warranty. The USGS will warrant the delivery of this product in
computer-readable format and will offer appropriate adjustment of
credit when the product is determined unreadable by correctly
adjusted computer input peripherals, or when the physical medium is
delivered in damaged condition. Requests for adjustment of credit
must be made within 90 days from the date of this shipment from the
ordering site.

Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: TIFF

Format_Version_Number: 6.0

File_Decompression_Technique: Packbits

Digital_Transfer_Option:
Offline_Option:
Offline_Media: "CD-ROM"

Recording_Format:
"ISO 9660"; DRG image files with
corresponding metadata files.

Fees:
For delivery on CD-ROM, the charge is $32 per CD-ROM

Metadata_Reference_Information:
Metadata_Date: 19970414

Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey

Contact_Address:
Address_Type: "mailing address"

Address: 590 National Center

City: Reston

State_or_Province: Virginia

Postal_Code: 22092

Contact_Voice_Telephone: 1 703 648 4533

Contact_Electronic_Mail_Address:
Copies of this publication are
available from anonymous File Transfer Protocol (anonymous FTP);
ftp://fgdc.er.usgs.gov/

Metadata_Standard_Name:
"Content Standards for Digital Geospatial
Metadata"

Metadata_Standard_Version: FGDC-STD-001-1998